US6170456B1 - Lubricating device for four-stroke engine - Google Patents
Lubricating device for four-stroke engine Download PDFInfo
- Publication number
- US6170456B1 US6170456B1 US09/260,546 US26054699A US6170456B1 US 6170456 B1 US6170456 B1 US 6170456B1 US 26054699 A US26054699 A US 26054699A US 6170456 B1 US6170456 B1 US 6170456B1
- Authority
- US
- United States
- Prior art keywords
- oil
- lubricating device
- crankcase
- trough
- crankshaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
- F01M9/06—Dip or splash lubrication
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
- F01M11/06—Means for keeping lubricant level constant or for accommodating movement or position of machines or engines
- F01M11/062—Accommodating movement or position of machines or engines, e.g. dry sumps
- F01M11/064—Movement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
- F01M11/0004—Oilsumps
- F01M2011/0037—Oilsumps with different oil compartments
- F01M2011/0041—Oilsumps with different oil compartments for accommodating movement or position of engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four
Definitions
- the present invention involves a lubricating device for a four-stroke engine, and especially a system that can lubricate an engine running on any inclination.
- a four-stroke engine Compared with a two-stroke engine, a four-stroke engine has the advantages of cleaner exhaust and fuel saving. As such, more and more light duty, general industrial/agricultural machines adopt a four-stroke engine according to the Regulation on Environmental Protection.
- a wet (wet sump) and a dry type are two types of lubricating devices used for a four-stroke engine, i.e., a wet (wet sump) and a dry type. A difference between them is whether or not a common space is used for the crankcase and the oil box.
- FIG. 1 shows a design of American RYOBI Co. published in SAE TECHNICAL PAPER SERIES 961728, which is a common wet lubricating device for a four-stroke engine.
- a crankcase 11 and an oil box of the four-stroke engine have a common space, i.e., it is a so-called wet sump.
- This device can be used with certain light duty tools, such as a grass cutter, lopping shears, wood saw and so on. As will be appreciated, these tools are widely used and operated on various inclinations.
- the engine 10 is restricted to operating on no more than a slight inclination to avoid oil flowing out from the oil box.
- oil will flow out from the oil box to the gap between the piston 13 and the cylinder wall and will be pumped into the combustion chamber, resulting in engine failure or oil flowing into the cylinder head and then out from the vent/filter.
- FIG. 2 shows a design of Japanese Patent of Application No. 7-327665, Application date of Dec. 15, 1995, in which a proper amount of oil is pumped to points to be lubricated in the engine, or oil 22 is splashed by a slinger 21 to create an oil fog which is pumped to the crankcase 23 and the cylinder head 25 for lubrication using suction generated by the piston 24 .
- the dry sump has a better structure than the wet sump, an additional oil trough, pressure regulating devices and additional drillings in the crankshaft are needed, resulting in a more complex structure and higher cost.
- a major object of the present invention is to provide a semi-separate crankcase design, in which an oil trough is provided under the crankcase.
- the oil trough has an internal space just large enough for an oil dipper arm moving in it to create an oil mist for lubrication, so that only a little bit of oil may flow into the crankcase when the engine is inclined.
- Another object of the present invention is to arrange a hole in the bottom of the oil trough.
- the hole forms a path from the oil box to the oil trough, and has a selected diameter that ensures a great amount of oil will not enter the crankcase when the engine is inclined.
- a further object of the present object is to provide several plugs, each having an orifice, in the bottom of the crankcase. Therefore, even if the engine is running upside-down, oil will drop into the crankcase and be atomized by the rotating components for lubrication.
- FIG. 1 is a conventional wet type lubricating device for a four-stroke engine
- FIG. 2 is a conventional dry type lubricating device for a four-stroke engine
- FIG. 3 is a front view of the present invention
- FIG. 4 is a side view of the present invention.
- FIG. 5 is a schematic sectional view of oil routes in a lower crankcase body of the present invention.
- FIG. 6 is an embodiment of the present invention utilized with a four-stroke engine.
- FIG. 3 is a front view of the present invention in which the lubricating device has a semi-separate crankcase.
- a crankcase 30 of the present invention includes an upper crankcase body 31 and a lower crankcase body 32 .
- the upper crankcase body 31 may be integrated with a cylinder block 40 or manufactured separately.
- the lower crankcase body 32 matches the upper crankcase body 31 , and the two cases 31 , 32 are joined together by bolts 33 to form a closed enclosure, i.e., the crankcase 30 .
- a crankshaft 50 is provided in the crankcase 30 .
- the crankshaft 50 has a bearing 51 and an oil seal 52 arranged at both ends respectively so that the crankshaft 50 is contained in the crankcase 30 and is able to rotate in the crankcase 30 .
- the crankshaft 50 is equipped with a connecting rod 53 .
- An oil dipper 54 is arranged at the lower end of the connecting rod 53 .
- the oil dipper 54 may be bar-shaped and fixed beneath the crankshaft 50 , or integrated with the crankshaft and driven by a piston 70 . Movement of the piston 70 causes reciprocating motion of the connecting rod 53 and rotation of the crankshaft 50 .
- the lower crankcase body 32 extends downward at its central part to form an oil trough 321 , and a hole 322 is arranged in the bottom of the oil trough at its central point. Further, several through holes are provided adjacent to the oil trough 321 . The holes have oil plugs 34 inserted therein.
- An oil sump 60 is joined to the bottom of the lower crankcase body 32 .
- a closed enclosure forms an oil box 61 in which oil 62 is contained, between the oil sump 60 and the lower crankcase body 32 .
- the amount of oil 62 shall not exceed one half of the capacity of the oil box.
- the oil trough 321 formed by the extension of the lower crankcase body 32 extends into the oil box 61 so that part of the oil 62 in the oil box 61 gets into the oil trough 321 through the hole 322 , and reaches a same oil level 621 as that of the oil 62 in the oil box 61 .
- the oil trough 321 provides a very small space which is just large enough for the moving of the oil dipper 54 therein. Therefore, the volume of oil 62 kept in the oil trough 321 will not be large.
- the oil dipper 54 when the crankshaft 50 rotates, the oil dipper 54 will enter the oil trough 321 and stir up the oil 62 continually. Since the crankshaft 50 and the connecting rod 53 are moving at a high speed, the oil stirred up by the oil dipper 54 will be atomized to create oil mist which will spread inside the engine and adhere everywhere inside of the crankcase 30 , thus providing lubrication between the piston 70 and the cylinder block 40 , between the piston 70 and the connecting rod 53 , between the connecting rod 53 and the crankshaft 50 , and lubricating bearings 51 .
- FIG. 5 is a schematic sectional view of the oil routes in a lower crankcase body of the present invention.
- oil mist which enters the cylinder head 80 is filtered by a breather filter 82 and will be condensed as oil drops.
- the oil drops will flow into the oil trough 321 through the space 81 and the oil routes 323 , or return to the oil box 61 through the oil plugs 34 .
- FIG. 6 is an exemplary embodiment of the present invention, in which the oil plugs 34 may be made from a rubber or spongy type material.
- the oil plugs 34 may be made from a rubber or spongy type material.
- an orifice 341 is provided so that oil 62 may pass through the orifice 341 in the oil plug 34 . If oil plugs of a foam rubber material are used, oil 62 will drop down from the plugs using capillary action.
- oil 62 When the engine is running on a large inclination for a long time, oil 62 will fail to get into the oil trough 321 through the hole 322 and the oil dipper 54 will be running idle. In that case, oil 62 will drop onto rotating components from the orifices 341 in the oil plugs 34 . The oil drops will be atomized by the high speed rotating components to ensure lubrication in the engine.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Abstract
Description
Claims (13)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW087221914U TW370160U (en) | 1998-12-31 | 1998-12-31 | 4-stroke engine lubrication system |
TW87221914 | 1998-12-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
US6170456B1 true US6170456B1 (en) | 2001-01-09 |
Family
ID=21639099
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/260,546 Expired - Lifetime US6170456B1 (en) | 1998-12-31 | 1999-03-02 | Lubricating device for four-stroke engine |
Country Status (2)
Country | Link |
---|---|
US (1) | US6170456B1 (en) |
TW (1) | TW370160U (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6374796B1 (en) * | 1998-03-05 | 2002-04-23 | Mtd Southwest Inc. | Multiple-position, operator-carried, four-stroke engine |
US20030140888A1 (en) * | 2002-01-29 | 2003-07-31 | Yoshinobu Tanaka | Engine and personal watercraft equipped with engine |
US20040255895A1 (en) * | 1999-01-25 | 2004-12-23 | Hirsch Nicholas Robert | Four-stroke internal combustion engine |
US20050101199A1 (en) * | 2000-08-25 | 2005-05-12 | Gibbs Alan T. | Power train for amphibian |
US20050279318A1 (en) * | 2004-06-21 | 2005-12-22 | Nagel John J | Four-stroke internal combustion engine |
US7481197B1 (en) * | 2007-10-03 | 2009-01-27 | Industrial Technology Research Institute | Lubrication device of four-stroke engines |
EP2045449A1 (en) | 2007-10-03 | 2009-04-08 | Industrial Technology Research Institute | Lubrication device of four-stroke engines |
US20090090327A1 (en) * | 2007-10-03 | 2009-04-09 | Industrial Technology Research Institute | Lubrication device of four-stroke engines |
US20090272360A1 (en) * | 2007-10-03 | 2009-11-05 | Industrial Technology Research Institute | Lubrication device of four-stroke engines |
CN101813015A (en) * | 2010-03-04 | 2010-08-25 | 力帆实业(集团)股份有限公司 | Gasoline engine lubricating structure |
CN101413412B (en) * | 2007-10-16 | 2010-10-06 | 财团法人工业技术研究院 | Lubrication apparatus of four-stroke engine |
EP2450536A1 (en) * | 2010-11-04 | 2012-05-09 | Steenfun | Engine for motorbike |
US20130074792A1 (en) * | 2011-09-22 | 2013-03-28 | Etg Limited | Engine Lubrication Method |
US20170101908A1 (en) * | 2015-10-07 | 2017-04-13 | Makita Corporation | Lubricating device for engine |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3687233A (en) * | 1970-07-23 | 1972-08-29 | Garrett Corp | Integral lubrication system |
US4270497A (en) * | 1979-08-22 | 1981-06-02 | Valerio Robert M | Oil pan for internal combustion engines |
US5176116A (en) * | 1990-12-26 | 1993-01-05 | Ryobi Limited | Lubricating device of four-stroke cycle engine unit for portable working machine |
JPH09170417A (en) | 1995-12-15 | 1997-06-30 | Honda Motor Co Ltd | Lubrication device for four-cycle engine |
US5738062A (en) * | 1991-12-02 | 1998-04-14 | Ryobi Outdoor Products, Inc. | Operator carried power tool having a four-cycle engine |
US5860403A (en) * | 1996-10-09 | 1999-01-19 | Honda Giken Kogyo Kagushiki Kaisha | System for producing lubricating oil mist in engine |
US5960764A (en) * | 1997-03-03 | 1999-10-05 | Kioritz Corporation | Four-stroke internal combustion engine |
US5975042A (en) * | 1997-06-26 | 1999-11-02 | Ishiakawjima-Shibaura Machinery Co., Ltd. | Oil supply apparatus of a four-stroke-cycle engine |
-
1998
- 1998-12-31 TW TW087221914U patent/TW370160U/en unknown
-
1999
- 1999-03-02 US US09/260,546 patent/US6170456B1/en not_active Expired - Lifetime
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3687233A (en) * | 1970-07-23 | 1972-08-29 | Garrett Corp | Integral lubrication system |
US4270497A (en) * | 1979-08-22 | 1981-06-02 | Valerio Robert M | Oil pan for internal combustion engines |
US5176116A (en) * | 1990-12-26 | 1993-01-05 | Ryobi Limited | Lubricating device of four-stroke cycle engine unit for portable working machine |
US5738062A (en) * | 1991-12-02 | 1998-04-14 | Ryobi Outdoor Products, Inc. | Operator carried power tool having a four-cycle engine |
JPH09170417A (en) | 1995-12-15 | 1997-06-30 | Honda Motor Co Ltd | Lubrication device for four-cycle engine |
US5860403A (en) * | 1996-10-09 | 1999-01-19 | Honda Giken Kogyo Kagushiki Kaisha | System for producing lubricating oil mist in engine |
US5960764A (en) * | 1997-03-03 | 1999-10-05 | Kioritz Corporation | Four-stroke internal combustion engine |
US5975042A (en) * | 1997-06-26 | 1999-11-02 | Ishiakawjima-Shibaura Machinery Co., Ltd. | Oil supply apparatus of a four-stroke-cycle engine |
Non-Patent Citations (1)
Title |
---|
Conley, et al., "The New Ryobi 26.2 CC, OHV, 4-Stroke Engine For Hand Held Power Equipment Applications", SAE Technical Paper Series 961728, Aug. 26-28, 1996. |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6374796B1 (en) * | 1998-03-05 | 2002-04-23 | Mtd Southwest Inc. | Multiple-position, operator-carried, four-stroke engine |
US6772726B2 (en) * | 1998-03-05 | 2004-08-10 | Mtd Southwest, Inc. | Multiple-position, operator-carried, four-stroke engine |
US20040255895A1 (en) * | 1999-01-25 | 2004-12-23 | Hirsch Nicholas Robert | Four-stroke internal combustion engine |
US20050101199A1 (en) * | 2000-08-25 | 2005-05-12 | Gibbs Alan T. | Power train for amphibian |
US7214112B2 (en) | 2000-08-25 | 2007-05-08 | Gibbs Technologies Limited | Amphibious vehicle |
US20030140888A1 (en) * | 2002-01-29 | 2003-07-31 | Yoshinobu Tanaka | Engine and personal watercraft equipped with engine |
US6889651B2 (en) * | 2002-01-29 | 2005-05-10 | Kawasaki Jukogyo Kabushiki Kaisha | Engine and personal watercraft equipped with engine |
US20050279318A1 (en) * | 2004-06-21 | 2005-12-22 | Nagel John J | Four-stroke internal combustion engine |
US7134418B2 (en) | 2004-06-21 | 2006-11-14 | Briggs & Stratton Corporation | Four-stroke internal combustion engine |
EP2045449A1 (en) | 2007-10-03 | 2009-04-08 | Industrial Technology Research Institute | Lubrication device of four-stroke engines |
US7481197B1 (en) * | 2007-10-03 | 2009-01-27 | Industrial Technology Research Institute | Lubrication device of four-stroke engines |
US20090090327A1 (en) * | 2007-10-03 | 2009-04-09 | Industrial Technology Research Institute | Lubrication device of four-stroke engines |
JP2009092066A (en) * | 2007-10-03 | 2009-04-30 | Ind Technol Res Inst | Lubrication device of four-stroke engine |
US7584736B2 (en) * | 2007-10-03 | 2009-09-08 | Industrial Technology Research Institue | Lubrication device of four-stroke engines |
US20090272360A1 (en) * | 2007-10-03 | 2009-11-05 | Industrial Technology Research Institute | Lubrication device of four-stroke engines |
CN101413412B (en) * | 2007-10-16 | 2010-10-06 | 财团法人工业技术研究院 | Lubrication apparatus of four-stroke engine |
CN101813015A (en) * | 2010-03-04 | 2010-08-25 | 力帆实业(集团)股份有限公司 | Gasoline engine lubricating structure |
EP2450536A1 (en) * | 2010-11-04 | 2012-05-09 | Steenfun | Engine for motorbike |
WO2012059357A1 (en) * | 2010-11-04 | 2012-05-10 | Steenfun | Motorcycle engine |
US20130074792A1 (en) * | 2011-09-22 | 2013-03-28 | Etg Limited | Engine Lubrication Method |
US20170101908A1 (en) * | 2015-10-07 | 2017-04-13 | Makita Corporation | Lubricating device for engine |
US10590815B2 (en) * | 2015-10-07 | 2020-03-17 | Makita Corporation | Lubricating device for engine |
DE102016009347B4 (en) | 2015-10-07 | 2021-10-28 | Makita Corporation | Lubricating device for an engine |
Also Published As
Publication number | Publication date |
---|---|
TW370160U (en) | 1999-09-11 |
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Owner name: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE, TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:GU, HUAN-LUNG;LI, SHAO-YU;CHEN, LI-YU;AND OTHERS;REEL/FRAME:009811/0013 Effective date: 19990128 |
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